单项选择题

To ______ is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment.

A. conserve
B. conceive
C. convert
D. contrive
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单项选择题
I ______ him the Christmas gift by mail because he came home during the Christmas holidays.
A. ought to have sent
B. couldn't have sent
C. must have sent
D. needn't have sent
单项选择题
Changing from solid to liquid, water takes in heat from all substances near it, and this ______ produces artificial cold surrounding it.
A. absorption
B. transition
C. consumption
D. interaction
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